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Or they're using "surplus" resources (like their backyard, and domestic food scraps) that they'd still have otherwise. Which is something that is not commercially scalable. Unless, I guess, someone tries "Uber but for chickens".

OTOH for shop bought eggs you also have to add transport (fuel/truck maintenance), storage, commercial land rent/interest costs, electricity, and of course the mark-ups along the way by processors, distributors, and—most of all—the shops themselves, that use their monopoly powers to reduce the margins for everyone else. And if we're doing like-for-like, you have to buy certified 'Pasture Raised' eggs.

Exactly, even with it being excess, I think the motivation is to reduce waste versus produce money in these situations. They have uses for the waste, it can be eaten by an animal, but that’s also true if it doesn’t get sold